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Homework Help: LS-coupling for configurations with equivalent electrons

  1. Aug 5, 2008 #1
    List the values of the magnetic quantum numbers ml1, ml2
    ms1 and ms2 for the two electrons in a np2 configuration to show that fifteen degenarate states exists within the central field approximation.

    ml can take values -1,0,1 i believe.
    ms can take values -1/2 and 1/2.

    how does this ad up to fifteen degenarate states?
    Last edited: Aug 5, 2008
  2. jcsd
  3. Aug 5, 2008 #2


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    You are doing as if there was only a single electron.

    You must combine the two l=1 states to get the total orbital angular momentum.
    Then you must combine the two s=1/2 states to get the total spin.
    Now, you must make sure that you include only states that are antisymmetric.
  4. Aug 6, 2008 #3
    Thank you, With your help i solved it.
  5. Nov 23, 2009 #4
    Why do you only take in acount for the antisymmetric states?

    Can someone give an exampel on how a antisymmteric states looks like for, 2 electrons and 3 electrons?

    Thank you, Joqe
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